git.sesse.net Git - vlc/blob - plugins/motion/motion.c

   1 /*****************************************************************************
   2  * motion.c : C motion compensation module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  * $Id: motion.c,v 1.17 2002/06/01 12:32:00 sam Exp $
   6  *
   7  * Authors: Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
   8  *          Michel Lespinasse <walken@zoy.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <stdlib.h>                                      /* malloc(), free() */
  29 #include <string.h>
  30
  31 #include <vlc/vlc.h>
  32
  33 /*****************************************************************************
  34  * Local and extern prototypes.
  35  *****************************************************************************/
  36 static void motion_getfunctions( function_list_t * p_function_list );
  37
  38 /*****************************************************************************
  39  * Build configuration tree.
  40  *****************************************************************************/
  41 MODULE_CONFIG_START
  42 MODULE_CONFIG_STOP
  43
  44 MODULE_INIT_START
  45     SET_DESCRIPTION( _("motion compensation module") )
  46     ADD_CAPABILITY( MOTION, 50 )
  47     ADD_SHORTCUT( "c" )
  48 MODULE_INIT_STOP
  49
  50 MODULE_ACTIVATE_START
  51     motion_getfunctions( &p_module->p_functions->motion );
  52 MODULE_ACTIVATE_STOP
  53
  54 MODULE_DEACTIVATE_START
  55 MODULE_DEACTIVATE_STOP
  56
  57 /*****************************************************************************
  58  * Simple motion compensation in C
  59  *****************************************************************************/
  60
  61 #define avg2(a,b) ((a+b+1)>>1)
  62 #define avg4(a,b,c,d) ((a+b+c+d+2)>>2)
  63
  64 #define predict_o(i) (ref[i])
  65 #define predict_x(i) (avg2 (ref[i], ref[i+1]))
  66 #define predict_y(i) (avg2 (ref[i], (ref+stride)[i]))
  67 #define predict_xy(i) (avg4 (ref[i], ref[i+1], (ref+stride)[i], (ref+stride)[i+1]))
  68
  69 #define put(predictor,i) dest[i] = predictor (i)
  70 #define avg(predictor,i) dest[i] = avg2 (predictor (i), dest[i])
  71
  72 // mc function template
  73
  74 #define MC_FUNC(op,xy)                                                      \
  75 static void MC_##op##_##xy##16_c (yuv_data_t * dest, yuv_data_t * ref,      \
  76                                  int stride, int height)                    \
  77 {                                                                           \
  78     do {                                                                    \
  79         op (predict_##xy, 0);                                               \
  80         op (predict_##xy, 1);                                               \
  81         op (predict_##xy, 2);                                               \
  82         op (predict_##xy, 3);                                               \
  83         op (predict_##xy, 4);                                               \
  84         op (predict_##xy, 5);                                               \
  85         op (predict_##xy, 6);                                               \
  86         op (predict_##xy, 7);                                               \
  87         op (predict_##xy, 8);                                               \
  88         op (predict_##xy, 9);                                               \
  89         op (predict_##xy, 10);                                              \
  90         op (predict_##xy, 11);                                              \
  91         op (predict_##xy, 12);                                              \
  92         op (predict_##xy, 13);                                              \
  93         op (predict_##xy, 14);                                              \
  94         op (predict_##xy, 15);                                              \
  95         ref += stride;                                                      \
  96         dest += stride;                                                     \
  97     } while (--height);                                                     \
  98 }                                                                           \
  99 static void MC_##op##_##xy##8_c (yuv_data_t * dest, yuv_data_t * ref,       \
 100                                 int stride, int height)                     \
 101 {                                                                           \
 102     do {                                                                    \
 103         op (predict_##xy, 0);                                               \
 104         op (predict_##xy, 1);                                               \
 105         op (predict_##xy, 2);                                               \
 106         op (predict_##xy, 3);                                               \
 107         op (predict_##xy, 4);                                               \
 108         op (predict_##xy, 5);                                               \
 109         op (predict_##xy, 6);                                               \
 110         op (predict_##xy, 7);                                               \
 111         ref += stride;                                                      \
 112         dest += stride;                                                     \
 113     } while (--height);                                                     \
 114 }
 115
 116 // definitions of the actual mc functions
 117
 118 MC_FUNC (put,o)
 119 MC_FUNC (avg,o)
 120 MC_FUNC (put,x)
 121 MC_FUNC (avg,x)
 122 MC_FUNC (put,y)
 123 MC_FUNC (avg,y)
 124 MC_FUNC (put,xy)
 125 MC_FUNC (avg,xy)
 126
 127 /*****************************************************************************
 128  * Functions exported as capabilities. They are declared as static so that
 129  * we don't pollute the namespace too much.
 130  *****************************************************************************/
 131 static void motion_getfunctions( function_list_t * p_function_list )
 132 {
 133     static void (* ppppf_motion[2][2][4])( yuv_data_t *, yuv_data_t *,
 134                                            int, int ) =
 135     {
 136         {
 137             /* Copying functions */
 138             {
 139                 /* Width == 16 */
 140                 MC_put_o16_c, MC_put_x16_c, MC_put_y16_c, MC_put_xy16_c
 141             },
 142             {
 143                 /* Width == 8 */
 144                 MC_put_o8_c,  MC_put_x8_c,  MC_put_y8_c, MC_put_xy8_c
 145             }
 146         },
 147         {
 148             /* Averaging functions */
 149             {
 150                 /* Width == 16 */
 151                 MC_avg_o16_c, MC_avg_x16_c, MC_avg_y16_c, MC_avg_xy16_c
 152             },
 153             {
 154                 /* Width == 8 */
 155                 MC_avg_o8_c,  MC_avg_x8_c,  MC_avg_y8_c,  MC_avg_xy8_c
 156             }
 157         }
 158     };
 159
 160 #define list p_function_list->functions.motion
 161     memcpy( list.ppppf_motion, ppppf_motion, sizeof( void * ) * 16 );
 162 #undef list
 163
 164     return;
 165 }